In addition to Depp as Bulger, the film will star Benedict Cumberbatch as Whitey’s brother, Billy Bulger; Jesse Plemons as Whitey’s longtime partner in crime, Kevin Weeks; Sienna Miller as Whitey’s lover, Catherine Greig; Dakota Johnson as Lindsey Cyr, Whitey’s former girlfriend and mother of his only child; Rory Cochrane as Steve Flemmi, another member of the Winter Hill Gang; Julianne Nicholson as John Connolly’s wife, Marianne; and Adam Scott as FBI Agent Robert Fitzpatrick.

Rounding out the main cast are David Harbour, Jeremy Strong, Brad Carter, W. Earl Brown and Corey Stoll.